Lingual arch

Lingual arch

A lingual arch is an orthodontic device which connects two molars in the upper or lower dental arch. The lower lingual arch (LLA) has an archwire adapted to the lingual side of the lower teeth. In the upper arch the archwire is usually connecting the two molars passing through the palatal vault, and is commonly referred as "Transpalatal Arch" (TPA).

LLA and TPA are fabricated by placing bands on the molars. These are connected to the archwire. The wire can be soldered to the bands or inserted into lingual sheaths welded to the molar band (removable LLA and TPA).

Passive Use

LLA is frequently used as a space maintainer for the lower teeth. In such a case a LLA maintains the molar position.LLA and TPA can also be used to stabilize molar position in the attempt to avoid side effects that can take place during orthodontic therapy. As a space maintainer LLA is frequentely used in cases where an early loss of the second deciduous molar takes place. In such a case LLA prevents the molars from migrating mesially (forward) thus blocking off the eruption space for the premolar teeth. LLA is also used in order to maintain the so called "Leeway space", which is the extra space available in the arch when the second deciduous molar is esfoliated and the second premolar erupts [The use of the lingual arch in the mixed dentition to resolve incisor crowding. PMID 10629524 ] . Active Use

LLA and TPA, if removable, can also be activated in order to obtain molar movements in all planes of space [Biomechanical fundamentals in the use of the transpalatal arch and the ligual arch. PMID 2074877 ] .LLA and TPA are more frequently activated to expand or reduce the intermolar distance and to rotate the molars. In this way it is possible to reshape the whole dental arch if molars are connected to the other teeth by means of a buccal archwire.

LLA and TPA archwires are usually made out of stainless steel with a 0.032" cross section for a passive use.A beta-titanium wire is more effective if LLA or TPA must be activated to displace molars (Active Use).

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • lingual arch — a wire appliance made to conform to the lingual aspect of the dental arch; used to promote or to prevent movement of the teeth in orthodontic therapy. Lingual arch used to maintain space for premolars after premature loss of the primary molars …   Medical dictionary

  • lingual arch — n. (Dentistry) orthodontic wire fastened from molar to molar in the inside of a person s teeth …   English contemporary dictionary

  • fixed lingual arch — a space retaining appliance consisting of an arch wire designed to fit the lingual surface of the teeth, and soldered to metal crowns or orthodontic bands. Called also stationary lingual a …   Medical dictionary

  • stationary lingual arch — fixed lingual a …   Medical dictionary

  • passive lingual arch — an orthodontic appliance for maintaining space and preserving arch length when bilateral primary molars are prematurely lost …   Medical dictionary

  • Lingual septum — The mouth cavity. The cheeks have been slit transversely and the tongue pulled forward. (Lingual septum is visible at center of tongue, but not labeled.) …   Wikipedia

  • arch — Any structure resembling a bent bow or an a.; an arc. In anatomy, any vaulted or archlike structure. See arcus. SYN: arcus [TA]. [thru O. Fr. fr. L. arcus, bow] abdominothoracic a. a bell shaped line defined by the lower end of the sternum and… …   Medical dictionary

  • Lingual veins — Vein: {{{Name}}} Veins of the tongue. (Lingual vein labeled at left.) Latin vena lingualis ))))) Gray s …   Wikipedia

  • Lingual frenectomy — A lingual frenectomy is a form of frenectomy associated with the tongue.The removal of the lingual frenulum under the tongue can be accomplished with either frenectomy or frenuloplasty. This is used to treat a tongue tied patient. Immediately… …   Wikipedia

  • lingual occlusion — malocclusion in which the tooth is lingual to the line of the normal dental arch. Called also linguoclusion …   Medical dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”